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Input: ili210x - rework the touchscreen sample processing

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Get rid of the packed structures for representing data as that does not
apply to other similar Ilitek touchscreens. Instead, implement a function
which parses the data and reports touch events and coordinates.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Marek Vasut 2019-02-06 22:01:07 -08:00 committed by Dmitry Torokhov
parent 1bdec5d981
commit e3559442af
1 changed files with 30 additions and 25 deletions
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55
drivers/input/touchscreen/ili210x.c
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@ -7,6 +7,7 @@
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/gpio/consumer.h>
#include <asm/unaligned.h>
#define MAX_TOUCHES 2
#define DEFAULT_POLL_PERIOD 20
@ -17,20 +18,11 @@
#define REG_FIRMWARE_VERSION 0x40
#define REG_CALIBRATE 0xcc
struct finger {
struct panel_info {
u8 x_low;
u8 x_high;
u8 y_low;
u8 y_high;
} __packed;
struct touchdata {
u8 status;
struct finger finger[MAX_TOUCHES];
} __packed;
struct panel_info {
struct finger finger_max;
u8 xchannel_num;
u8 ychannel_num;
} __packed;
@ -75,25 +67,35 @@ static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
return 0;
}
static void ili210x_report_events(struct input_dev *input,
const struct touchdata *touchdata)
static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
if (finger >= MAX_TOUCHES)
return false;
if (touchdata[0] & BIT(finger))
return false;
*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
return true;
}
static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
{
struct input_dev *input = priv->input;
int i;
bool touch;
unsigned int x, y;
const struct finger *finger;
for (i = 0; i < MAX_TOUCHES; i++) {
input_mt_slot(input, i);
finger = &touchdata->finger[i];
touch = touchdata->status & (1 << i);
touch = ili210x_touchdata_to_coords(priv, touchdata, i, &x, &y);
input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
if (touch) {
x = finger->x_low | (finger->x_high << 8);
y = finger->y_low | (finger->y_high << 8);
input_report_abs(input, ABS_MT_POSITION_X, x);
input_report_abs(input, ABS_MT_POSITION_Y, y);
}
@ -101,6 +103,8 @@ static void ili210x_report_events(struct input_dev *input,
input_mt_report_pointer_emulation(input, false);
input_sync(input);
return touchdata[0] & 0xf3;
}
static void ili210x_work(struct work_struct *work)
@ -108,20 +112,21 @@ static void ili210x_work(struct work_struct *work)
struct ili210x *priv = container_of(work, struct ili210x,
dwork.work);
struct i2c_client *client = priv->client;
struct touchdata touchdata;
u8 touchdata[1 + 4 * MAX_TOUCHES];
bool touch;
int error;
error = ili210x_read_reg(client, REG_TOUCHDATA,
&touchdata, sizeof(touchdata));
touchdata, sizeof(touchdata));
if (error) {
dev_err(&client->dev,
"Unable to get touchdata, err = %d\n", error);
return;
}
ili210x_report_events(priv->input, &touchdata);
touch = ili210x_report_events(priv, touchdata);
if (touchdata.status & 0xf3)
if (touch)
schedule_delayed_work(&priv->dwork,
msecs_to_jiffies(priv->poll_period));
}
@ -235,8 +240,8 @@ static int ili210x_i2c_probe(struct i2c_client *client,
return error;
}
xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8);
ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8);
xmax = panel.x_low | (panel.x_high << 8);
ymax = panel.y_low | (panel.y_high << 8);
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)